Humanity seemed to be doomed after a deadly virus appeared on Earth. The only ones who can survive this unknown epidemic are kids under the age of 13. But they pay an even higher price to survive. Little Yuuichirou Hyakuya dreams of defeating his tormentors and liberating himself and his foster brothers from their shackles forever. He is enslaved by vampires from a long time ago and mistreated as their blood donor. He hasn't yet discovered what it's like to lose a significant person, though, as he travels.
